收藏本站
...the world's most energy friendly microcontrollers
Figure 21.3. LETIMER One-shot Repeat State Machine
Wait for positive clock edge
If (STOP)
RUNNING = 0
NO
RUNNING
YES
Else if (START)
RUNNING = 1
End if
NO
START
START = 0
STOP = 0
YES
CNT = CNT - 1
NO
CNT = = 0
CNT = = 0
NO
CNT = CNT - 1
YES
YES
CNT = TOP*
CNT = TOP*
NO
REP0 = = 0
REP0 < 2
NO
If (! START)
REP0 = REP0 - 1
YES
YES
STOP = 1
REP0 = 0
TOP*
If (COMP0TOP)
TOP* = COMP0
Else
TOP* = 0xFFFF
TOP* *
If (! COMP0TOP)
TOP* * = 0xFFFF
Else if (COMPBUF)
TOP* * = COMP1
Else
TOP* * = COMP0
21.3.3.2.3 Buffered Mode
The Buffered repeat mode allows buffered timer operation. When started, the timer runs
LETIMERn_REP0 number of times. If LETIMERn_REP1 has been written since the last time it was used
and it is nonzero, LETIMERn_REP1 is then loaded into LETIMERn_REP0, and counting continues the
new number of times. The timer keeps going as long as LETIMERn_REP1 is updated with a nonzero
value before LETIMERn_REP0 is finished counting down.
If the timer is started when both LETIMERn_CNT and LETIMERn_REP0 are zero but LETIMERn_REP1
is non-zero, LETIMERn_REP1 is loaded into LETIMERn_REP0, and the counter counts the loaded
number of times. The state machine for the one-shot repeat mode is shown in Figure 21.3 (p. 291) .
Used in conjunction with a buffered top value, enabled by setting BUFTOP in LETIMERn_CTRL, the
buffered mode allows buffered values of both the top and repeat values of the timer, and the timer can
for instance be set to run 4 times with period 7 (top value 6), 6 times with period 200, then 3 times with
period 50.
A state machine for the buffered repeat mode is shown in Figure 21.4 (p. 292) . REP1 USED shown in the
state machine is an internal variable that keeps track of whether the value in LETIMERn_REP1 has been
loaded into LETIMERn_REP0 or not. The purpose of this is that a value written to LETIMERn_REP1
should only be counted once. REP1 USED is cleared whenever LETIMERn_REP1 is written.
2011-04-12 - d0001_Rev1.10
291
www.energymicro.com
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
EFM32GG-STK3700 KIT STARTER GIANT GECKO
EFM32LG-DK3650 KIT DEV EFM32 LEOPARD GECKO
EK-K7-KC705-CES-G-J KINTEX-7 FPGA KC705 EVAL KIT
EK-S6-SP601-G KIT EVAL SPARTAN 6 SP601
EK-S6-SP605-G KIT EVAL SPARTAN 6 SP605
EK-V6-ML631-G-J VIRTEX-6 HXT FPGA ML631 EVAL KIT
EK-V7-VC707-CES-G VIRTEX-7 VC707 EVAL KIT
EK-Z7-ZC702-CES-G ZYNQ-7000 EPP ZC702 EVAL KIT
相关代理商/技术参数
EFM32GG230F1024 功能描述:ARM微控制器 - MCU 1024KB FL 128KB RAM RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT
EFM32GG230F1024G-E-QFN64R 功能描述:IC MCU 32BIT 1MB FLASH 64QFN 制造商:silicon labs 系列:Giant Gecko 包装:剪切带（CT） 零件状态:在售 核心处理器:ARM? Cortex?-M3 核心尺寸:32-位 速度:48MHz 连接性:I2C，IrDA，智能卡，SPI，UART/USART 外设:欠压检测/复位，DMA，POR，PWM，WDT I/O 数:56 程序存储容量:1MB（1M x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:128K x 8 电压 - 电源（Vcc/Vdd）:1.98 V ~ 3.8 V 数据转换器:A/D 8x12b，D/A 2x12b 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 封装/外壳:64-VFQFN 裸露焊盘 供应商器件封装:64-QFN（9x9） 标准包装:1
EFM32GG230F1024-QFN64 制造商:Energy Micro AS 功能描述:GIANT GECKO MCU - Cut TR (SOS) 制造商:Energy Micro 功能描述:GIANT GECKO MCU 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN
EFM32GG230F1024-QFN64T 制造商:Energy Micro AS 功能描述:GIANT GECKO MCU - Trays
EFM32GG230F1024-QFN64-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN
EFM32-GG230F1024-SK 制造商:Energy Micro AS 功能描述:GIANT GECKO SAMPLE KIT - Bulk
EFM32GG230F1024-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN
EFM32GG230F512 功能描述:ARM微控制器 - MCU 512KB FL 128KB RAM RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT